LOCATION.--Lat 40°56'10.5", long
73°54'15.5" referenced to North American Datum of
1983, Westchester County, NY, Hydrologic Unit 02030101, on left
bank 500ft upstream of Water Grant Street, 4.2 mi upstream of
Halem River and 6.4 mil upstream of the George Washington
Bridge on Interstate 95, in Yonkers, New York.
PERIOD OF DAILY RECORD1.--WATER TEMPERATURE:
May 2019 to current year (non-winter seasons only).
SPECIFIC CONDUCTANCE: May 2019 to current year (non-winter
seasons only).
SALINITY: May 2019 to current year (non-winter seasons
only).
pH: May 2019 to current year (non-winter seasons only).
DISSOLVED OXYGEN: May 2019 to current year (non-winter seasons
only).
TURBIDITY: May 2019 to current year (non-winter seasons
only).
INSTRUMENTATION1.--A multi-parameter
water-quality sonde measures water temperature, specific
conductance, pH, dissolved oxygen, and turbidity at 15-minute
intervals since May 2019. Salinity record computed from
specific-conductance readings.
COOPERATION1.--Maintained by the Hudson River
Environmental Conditions Observing System in cooperation with
Sarah Lawrence College.
EXTREMES FOR PERIOD OF DAILY RECORD1.--WATER
TEMPERATURE: Maximum, 30.0 °C, July 21, 2019; minimum, 4.4 °C,
Dec. 4, 2019.
SPECIFIC CONDUCTANCE: Maximum, 32,500 uS/cm @ 25 °C, Oct. 3,
2019; minimum, 253 uS/cm @ 25 °C, May 21, 2019.
SALINITY: Maximum, 20.3 psu, Oct. 3, 2019; minimum, 0.1 psu,
May 21, 2019.
pH: Maximum, 9.0, Aug. 23, 2022; minimum, 6.8, on several days
May 2019.
DISSOLVED OXYGEN: Maximum, 15.4 mg/L, Aug. 21, 2022; minimum,
3.6 mg/L, Sept. 12, 2022.
TURBIDITY: Maximum, 176 FNU, Apr. 19, 2022; minimum, 1.3 FNU,
Oct. 19, 2022.
1 Water-Quality Records
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